﻿C. 
  K. 
  Wead 
  — 
  Intensity 
  of 
  Sound. 
  

  

  25 
  

  

  that 
  fraction 
  of 
  the 
  total 
  volume 
  of 
  wind 
  which 
  goes 
  to 
  the 
  

   pipe 
  : 
  the 
  total 
  volume 
  was 
  found 
  by 
  measuring 
  the 
  bellows 
  

   and 
  the 
  distance 
  it 
  fell 
  while 
  the 
  indicator 
  moved 
  50 
  mm. 
  ; 
  

   this 
  was 
  119 
  cu. 
  ft. 
  = 
  337000 
  cc. 
  (say 
  34xl0 
  5 
  cc.) 
  with 
  an 
  uncer- 
  

   tainty 
  of 
  1 
  or 
  2 
  per 
  cent 
  on 
  account 
  of 
  the 
  folds 
  : 
  this 
  uncer- 
  

   tainty, 
  however, 
  does 
  not 
  affect 
  the 
  relative 
  values 
  given 
  in 
  the 
  

   tables, 
  for 
  it 
  is 
  an 
  uncertainty 
  in 
  our 
  knowledge, 
  not 
  in 
  the 
  

   action 
  of 
  the 
  bellows. 
  

  

  Table 
  II. 
  — 
  Ntnte 
  Stops 
  Dratyx: 
  One 
  Key 
  Depressed. 
  

  

  July 
  21. 
  

  

  1. 
  

  

  2. 
  

  

  3. 
  

  

  4. 
  

  

  

  5. 
  

  

  

  6. 
  

  

  7. 
  

  

  

  8. 
  

  

  Key. 
  

  

  t. 
  

  

  1-T-*. 
  

  

  V. 
  

  

  Corup. 
  Y. 
  

  

  4 
  

  

  -j-5. 
  

  

  6-5. 
  

  

  Energy. 
  

  

  

  

  

  c. 
  c. 
  

  

  

  

  

  

  ergs. 
  sec. 
  

  

  

  sec. 
  

  

  3-4 
  

  

  xl0 
  5 
  x 
  

  

  3-4xl0 
  5 
  x 
  

  

  34 
  x 
  

  

  10 
  5 
  x 
  

  

  per 
  cent. 
  

  

  10 
  6 
  x 
  

  

  L 
  

  

  67-37 
  

  

  •0148 
  

  

  

  

  _ 
  

  

  ._. 
  

  

  

  

  

  C 
  

  

  12-35 
  

  

  •0810 
  

  

  0662 
  

  

  

  0652 
  

  

  + 
  • 
  

  

  0010 
  

  

  + 
  1 
  

  

  5 
  

  

  165 
  

  

  c# 
  

  

  12-94 
  

  

  •0773 
  

  

  0625 
  

  

  

  0625 
  

  

  

  

  

  

  

  

  156 
  

  

  D 
  

  

  1332 
  

  

  •0751 
  

  

  0603 
  

  

  

  0598 
  

  

  + 
  

  

  5 
  

  

  + 
  

  

  8 
  

  

  151 
  

  

  I># 
  

  

  13-03 
  

  

  •0767 
  

  

  0619 
  

  

  

  0573 
  

  

  + 
  

  

  46 
  

  

  + 
  8 
  

  

  

  

  155 
  

  

  E 
  

  

  1525 
  

  

  •0656 
  

  

  0508 
  

  

  

  0549 
  

  

  — 
  

  

  41 
  

  

  — 
  7 
  

  

  6 
  

  

  127 
  

  

  F 
  

  

  14-56 
  

  

  •0687 
  

  

  0539 
  

  

  

  0526 
  

  

  + 
  

  

  13 
  

  

  + 
  2 
  

  

  5 
  

  

  135 
  

  

  F# 
  

  

  15-69 
  

  

  ■0637 
  

  

  0489 
  

  

  

  0504 
  

  

  — 
  

  

  15 
  

  

  -3 
  

  

  

  

  122 
  

  

  Gr 
  

  

  16-00 
  

  

  •0625 
  

  

  0477 
  

  

  

  0483 
  

  

  — 
  

  

  6 
  

  

  -1 
  

  

  3 
  

  

  119 
  

  

  G 
  

  

  16-79 
  

  

  •0596 
  

  

  0448 
  

  

  

  0463 
  

  

  — 
  

  

  15 
  

  

  — 
  3 
  

  

  2 
  

  

  112 
  

  

  A 
  

  

  17-08 
  

  

  •0586 
  

  

  0438 
  

  

  

  0443 
  

  

  — 
  

  

  5 
  

  

  -1 
  

  

  1 
  

  

  110 
  

  

  A# 
  

  

  17-21 
  

  

  •0581 
  

  

  0433 
  

  

  

  0424 
  

  

  + 
  

  

  9 
  

  

  + 
  2 
  

  

  1 
  

  

  108 
  

  

  B 
  

  

  1865 
  

  

  •0536 
  

  

  0388 
  

  

  

  0407 
  

  

  — 
  

  

  19 
  

  

  -4 
  

  

  7 
  

  

  97 
  

  

  c 
  

  

  17-58 
  

   67-43 
  . 
  

  

  •0569 
  . 
  

  

  0421 
  

  

  •0390 
  

  

  + 
  

  

  31 
  

  

  + 
  8 
  

  

  

  

  105 
  

  

  L 
  

  

  

  

  kfean 
  

  

  

  

  ±3-4 
  

  

  

  

  July 
  28. 
  

  

  1. 
  

  

  2- 
  

  

  3. 
  

  

  4. 
  

  

  8. 
  

  

  1. 
  

  

  2. 
  

  

  3. 
  

  

  4. 
  

  

  8. 
  

  

  Key. 
  

  

  i. 
  

  

  1-5-/. 
  

  

  Y. 
  

  

  Energy. 
  

  

  Key. 
  

  

  t. 
  

  

  1-S-*. 
  

  

  Y. 
  

  

  Energy. 
  

  

  - 
  

  

  c. 
  c. 
  

  

  ergs. 
  sec. 
  

  

  

  

  

  c. 
  c. 
  

  

  ergs. 
  sec. 
  

  

  

  

  

  3-4xl0 
  5 
  x 
  

  

  10 
  6 
  x 
  

  

  

  

  

  3-4 
  x 
  10 
  5 
  x 
  

  

  10 
  6 
  x 
  

  

  L 
  

  

  77-37 
  

  

  •0129 
  

  

  

  

  

  9.^ 
  

  

  24-29 
  

  

  •0412 
  

  

  •0286 
  

  

  71 
  

  

  c 
  

  

  17-87 
  

  

  •0560 
  

  

  •0431 
  

  

  108 
  

  

  «r# 
  

  

  24-37 
  

  

  •0410 
  

  

  •0285 
  

  

  71 
  

  

  c# 
  

  

  18-69 
  

  

  •0535 
  

  

  •0407 
  

  

  102 
  

  

  a 
  

  

  26 
  04 
  

  

  •0384 
  

  

  •0259 
  

  

  65 
  

  

  d 
  

  

  20-54 
  

  

  •0487 
  

  

  •0359 
  

  

  90 
  

  

  a$ 
  

  

  2283 
  

  

  •0438 
  

  

  •0313 
  

  

  78 
  

  

  d$ 
  

  

  21-21 
  

  

  •0471 
  

  

  •0344 
  

  

  86 
  

  

  b 
  

  

  27-33 
  

  

  •0366 
  

  

  •0242 
  

  

  60 
  

  

  e 
  

  

  23-25 
  

  

  •0430 
  

  

  •0303 
  

  

  76 
  

  

  c' 
  

  

  26-79 
  

  

  •0373 
  

  

  •0249 
  

  

  62 
  

  

  f 
  

  

  24-21 
  

  

  •0413 
  

  

  •0286 
  

  

  71 
  

  

  L 
  

  

  80-81 
  

  

  •0124 
  

  

  

  

  

  

  /# 
  

  

  24-10 
  

  

  •0415 
  

  

  •0289 
  

  

  72 
  

  

  

  

  

  

  The 
  energy 
  is 
  found 
  by 
  multiplying 
  the 
  volume 
  by 
  the 
  pres- 
  

   sure, 
  which 
  was 
  15*6 
  lbs. 
  per 
  sq. 
  ft. 
  or 
  7*6 
  gms. 
  per 
  sq. 
  cm. 
  

  

  .-. 
  Total 
  energyr=ll-9xl5*6 
  = 
  186 
  ft. 
  Ibs.=2'5xl0 
  9 
  ergs. 
  

   By 
  this 
  multiply 
  the 
  fractions 
  in 
  columns 
  headed 
  Y, 
  as 
  col. 
  6 
  

   table 
  I. 
  

  

  